The **SES-2HA-R/E2** is a high-performance **Magnetic Proximity Sensor** (often referred to as a Lead Switch or Magnetic Switch) manufactured by **Azbil (formerly Yamatake)**. It is primarily used in industrial automation to detect the position of pneumatic cylinders or moving mechanical parts. --- ### 1. Key Technical Specifications Below are the electronic and physical characteristics of the device: | Feature | Specification | | :--- | :--- | | **Switching Logic** | Reed Switch (Normally Open) | | **Operating Voltage** | 10 to 30 VDC / 5 to 120 VAC | | **Load Current Range** | 5 to 40 mA | | **Internal Voltage Drop** | 2.4 V or less | | **Indicator Light** | Red LED (Lights up when ON) | | **Response Time** | 1 ms or less | | **Protection Class** | IP67 (Dust-tight and water-resistant) | | **Cable Type** | 2-wire, PVC Oil-resistant cable (approx. 2m) | --- ### 2. Working Principle The SES-2HA-R/E2 operates based on the **Hall Effect or Reed principle**: 1. **Magnetic Field Detection:** The sensor contains a pair of ferromagnetic blades (reeds). 2. **Activation:** When a magnet (typically embedded in a pneumatic cylinder's piston) moves close to the sensor, the magnetic field forces the reeds to touch. 3. **Circuit Completion:** Once the reeds touch, the electrical circuit is completed, and the Red LED illuminates to signal that the "Home" or "End" position has been reached. --- ### 3. Wiring Diagram (2-Wire System) Since this is a 2-wire DC/AC sensor, it is wired in series with the load (PLC input or Relay). ```mermaid [Power Source (+)] ---- [Load (PLC Input)] ---- [Brown Wire] | [SES-2HA-R/E2] | [Power Source (-)] ---------------------------- [Blue Wire] ``` --- ### 4. Application Areas * **Pneumatic Cylinders:** Monitoring the stroke end-points of air cylinders. * **Robotic Grippers:** Confirming if a gripper is fully open or closed. * **Safety Interlocks:** Ensuring a guard or door is magnetically aligned before a machine starts. * **General Limit Switching:** Used in environments where non-contact sensing is preferred over mechanical limit switches to avoid wear and tear. --- ### 5. Installation Precautions * **Polarity:** For DC applications, ensure the Brown wire is connected to the positive side (via load) and Blue to the negative. * **Magnetic Interference:** Avoid mounting near large transformers or high-voltage lines that could cause false triggering. * **Clamping:** Do not overtighten the mounting screw to prevent cracking the resin housing.